A technician is responsible for overseeing twelve remote offices. There was a report of a power outage at one of the remote offices the night before， and now one of the servers there has not rebootedeven though it was shut down gracefully. The technician was forced to travel two hours just to turn theserver on.  Which of the following is the MOST cost effective way to prevent future travel？（）

• A、 Install a generator onsite.
• B、 Install a remote management card in the server.
• C、 Install an uninterruptible power supply （UPS） onsite.
• D、 Move the server to the main office.